Add to the 'Terms' section.

- [ ] Improve the '[.gitignore file](https://harshkapadia2.github.io/git_basics/#_gitignore_file)' sub-section.
- [ ] Add a code block to the '[Syntax](https://harshkapadia2.github.io/git_basics/#_syntax)' section instead of points.
- Add the missing syntax from https://riptutorial.com/git/example/885/ignoring-files-and-directories-with-a--gitignore-file
- [ ] Shift the '[Ignore files locally without modifying .gitignore](https://harshkapadia2.github.io/git_basics/#_ignore_files_locally_without_modifying_gitignore)' section to the '[General # 2](https://harshkapadia2.github.io/git_basics/#_general_2)' section. (**TBD**)